#include<cstdio>
#define NMAX 100000

using namespace std;

int Max, n, i, S;
int w[NMAX], p[NMAX], v[NMAX];

int main()
{
    freopen("rucsac.in", "r", stdin);
    freopen("rucsac.out", "w", stdout);
    scanf("%d%d",&n,&S);
    for(int i = 1; i <= n; ++i)
        scanf("%d%d",&w[i],&p[i]);

      for(int i = 1; i <= n; ++i)
        for(int j = S - w[i]; j >= 0 ; --j)
        {
            v[j + w[i]] = v[j] + p[i];
            if (v[j + w[i]] > Max) Max = v[j + w[i]];
        }

    printf("%d\n",Max);
    return 0;
}